expansion 音标拼音: [ɪksp'ænʃən] [ɪksp'æntʃən]
n . 张开,伸展;扩张,膨胀;扩张的,扩张部分
张开,伸展;扩张,膨胀;扩张的,扩张部分
expansion 扩充; 延伸
expansion 膨胀 扩展 扩充
expansion n 1 :
the act of increasing (
something )
in size or volume or quantity or scope [
synonym : {
expansion }, {
enlargement }] [
ant :
{
contraction }]
2 :
a function expressed as a sum or product of terms ; "
the expansion of (
a b )^
2 is a ^
2 2ab b ^
2 "
3 :
a discussion that provides additional information [
synonym :
{
expansion }, {
enlargement }, {
elaboration }]
4 :
adding information or detail [
synonym : {
expansion }, {
expanding upon }]
Expansion \
Ex *
pan "
sion \,
n . [
L .
expansio :
cf .
F .
expansion .]
1 .
The act of expanding or spreading out ;
the condition of being expanded ;
dilation ;
enlargement .
[
1913 Webster ]
2 .
That which is expanded ;
expanse ;
extend surface ;
as ,
the expansion of a sheet or of a lake ;
the expansion was formed of metal .
[
1913 Webster ]
The starred expansion of the skies . --
Beattie .
[
1913 Webster ]
3 .
Space through which anything is expanded ;
also ,
pure space .
[
1913 Webster ]
Lost in expansion ,
void and infinite . --
Blackmore .
[
1913 Webster ]
4 . (
Economics &
Commmerce )
an increase in the production of goods and services over time ,
and in the volume of business transactions ,
generally associated with an increase in employment and an increase in the money supply .
Opposite of {
contraction }.
Syn :
economic expansion . [
1913 Webster PJC ]
5 . (
Math .)
The developed result of an indicated operation ;
as ,
the expansion of (
a b )^{
2 }
is a ^{
2 }
2ab b ^{
2 }.
[
1913 Webster ]
6 . (
Steam Engine )
The operation of steam in a cylinder after its communication with the boiler has been cut off ,
by which it continues to exert pressure upon the moving piston .
[
1913 Webster ]
7 . (
Nav .
Arch .)
The enlargement of the ship mathematically from a model or drawing to the full or building size ,
in the process of construction . --
Ham .
Nav .
Encyc .
[
1913 Webster ]
Note :
Expansion is also used adjectively ,
as in expansion joint ,
expansion gear ,
etc .
[
1913 Webster ]
8 .
an enlarged or extended version of something ,
such as a writing or discourse ;
as ,
the journal article is an expansion of the lecture she gave .
[
PJC ]
9 .
an {
expansion joint }.
See below . [
Colloq .
or jargon ]
[
PJC ]
{
Expansion curve },
a curve the co ["
o ]
rdinates of which show the relation between the pressure and volume of expanding gas or vapor ;
esp . (
Steam engine ),
that part of an indicator diagram which shows the declining pressure of the steam as it expands in the cylinder .
{
Expansion gear } (
Steam Engine ).
a cut -
off gear .
See Illust .
of {
Link motion }.
{
Automatic expansion gear }
or {
Automatic cut -
off },
one that is regulated by the governor ,
and varies the supply of steam to the engine with the demand for power .
{
Fixed expansion gear },
or {
Fixed cut -
off },
one that always operates at the same fixed point of the stroke .
{
Expansion joint },
or {
Expansion coupling } (
Mech . &
Engin .),
a yielding joint or coupling for so uniting parts of a machine or structure that expansion ,
as by heat ,
is prevented from causing injurious strains ;
as :
(
a )
A slide or set of rollers ,
at the end of bridge truss ,
to support it but allow end play .
(
b )
A telescopic joint in a steam pipe ,
to permit one part of the pipe to slide within the other .
(
c )
A clamp for holding a locomotive frame to the boiler while allowing lengthwise motion .
(
d )
a strip of compressible material placed at intervals between blocks of poured concrete ,
as in roads or sidewalks .
{
Expansion valve } (
Steam Engine ),
a cut -
off valve ,
to shut off steam from the cylinder before the end of each stroke .
[
1913 Webster ]
222 Moby Thesaurus words for "
expansion ":
access ,
accession ,
accomplishment ,
accretion ,
accrual ,
accruement ,
accumulation ,
acreage ,
addition ,
advance ,
advancement ,
aggrandizement ,
amplification ,
amplitude ,
appreciation ,
area ,
ascent ,
attenuation ,
augmentation ,
ballooning ,
ballyhoo ,
big talk ,
bigness ,
bloating ,
blossoming ,
blowing up ,
body ,
boom ,
boost ,
bottoming out ,
breadth ,
broadcast ,
broadcasting ,
broadening ,
buildup ,
bulk ,
burgeoning ,
burlesque ,
business cycle ,
business fluctuations ,
bust ,
caliber ,
caricature ,
circumfusion ,
continuum ,
cooling off ,
coverage ,
crescendo ,
crisis ,
depression ,
depth ,
development ,
developmental change ,
diameter ,
diffraction ,
diffusion ,
dilatation ,
dilation ,
dilution ,
dimension ,
dimensions ,
dispensation ,
dispersal ,
dispersion ,
dissemination ,
dissipation ,
distance ,
distension ,
distention ,
distribution ,
divergence ,
downturn ,
economic cycle ,
economic expansion ,
economic growth ,
edema ,
elaboration ,
elevation ,
emptiness ,
empty space ,
enhancement ,
enlargement ,
evaporation ,
evolution ,
evolutionary change ,
evolvement ,
evolving ,
exaggerating ,
exaggeration ,
excess ,
exorbitance ,
expanding economy ,
expanse ,
expatiation ,
explication ,
extension ,
extent ,
extravagance ,
extreme ,
field ,
flood ,
flourishing ,
flowering ,
fragmentation ,
furtherance ,
gain ,
galactic space ,
gauge ,
girth ,
gradual change ,
grandiloquence ,
greatening ,
greatness ,
growth ,
gush ,
height ,
heightening ,
high growth rate ,
hike ,
huckstering ,
hyperbole ,
hyperbolism ,
increase ,
increment ,
infinite space ,
inflation ,
inordinacy ,
interstellar space ,
jump ,
largeness ,
leap ,
length ,
low ,
magnification ,
magnitude ,
market expansion ,
mass ,
maturation ,
measure ,
measurement ,
mounting ,
multiplication ,
natural development ,
natural growth ,
nonviolent change ,
nothingness ,
outer space ,
overemphasis ,
overestimation ,
overkill ,
overstatement ,
peak ,
peaking ,
peppering ,
prodigality ,
productiveness ,
profuseness ,
progress ,
progression ,
proliferation ,
propagation ,
proportion ,
proportions ,
prosperity ,
publication ,
puffery ,
puffing up ,
radiation ,
radius ,
raise ,
range ,
reach ,
recession ,
recovery ,
ripening ,
rise ,
scale ,
scattering ,
scatterment ,
scope ,
sensationalism ,
shotgun pattern ,
size ,
slowdown ,
slump ,
snowballing ,
sowing ,
space ,
spatial extension ,
spattering ,
sphere ,
splay ,
spread ,
spreading ,
sprinkling ,
stretch ,
stretching ,
strewing ,
superficial extension ,
superlative ,
surface ,
surge ,
swelling ,
tall talk ,
touting ,
tract ,
travesty ,
tumescence ,
unfolding ,
up ,
upping ,
upsurge ,
upswing ,
uptrend ,
upturn ,
void ,
volatilization ,
volume ,
waxing ,
widening ,
width ,
working -
out
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